Sash Balance Identification

A quick learner from Beaumont, TX, United States says:
Hey

This is the upper sash balance. The bottom sash balance is a spiral sash (same as Series 500).

The diameter of the sheath (if you like) is 7/16". The length of balance is 29 1/2". Other dimensions are in the pics.

I've looked and cannot find anything like this.

Cheers
Peter
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hey, Peter. This is an old balance that isn't being made anymore, but fortunately our S500-30 should be able to replace it. I would also recommend the Red Tip color option, an a 17-012 bracket so that it can attach to the sash.
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